专题 › CoCreate › Creo Elements/Direct截面(线割)命令如何使用？

Superman 发表于 2021-4-18 11:22:37

Creo Elements/Direct截面(线割)命令如何使用？

Creo Elements/Direct的<截面>命令是很常用的命令，英文版叫Section，习惯翻译为线割，该命令是将一个零件分割成两个或多个零件，它不会移除任何材料，只是创建一个或多个新零件。
此命令比较简单，主要是一个零件和剖切刀具，此剖切刀具的类型如菜单所示：
（翻译很烂，命令菜单翻译为<截面>，命令标题为<切片>）
分割工具可以是以下任何一种：面、曲面、平面、工具
工具类型描述
面 单个和多个平面，平面必须完全超出被分割零件边界
曲面 单个曲面，内部曲面曲面，或外部曲面，沿曲面延展方向切割
平面 零件内部的平面、外部的平面、工作平面，沿面的延伸方向分割零件；
工具 工作平面内的封闭轮廓、实体零件、曲面（需超出被分割零件边界）

按照分割工具类型，使用方法如下：
一、面单个或多个平面，平面必须完全超出被分割零件边界
如下图所示，多个平面将零件P1分割为两个零件
二、曲面内部曲面，或外部曲面，但必须是单个曲面，无需完全超出被分割零件，会按照曲面的延展方向切割。
内部曲面，比如半圆弧曲面，半圆弧自动延展，会将P1分割为P1和P1.1两个零件，如下所示：
外部曲面，可以是完全超出零件边界的，如下图所示
也可以不超出零件边界，但需确保曲面具有延展性，默认会沿着曲面的延展方向分割实体零件，如下图，所示：
三、平面零件内部的平面、外部的平面、工作平面，沿面的延伸方向分割零件；
可以是零件自身的平面，如下图所示：
也可以是工作平面，如下图，以工作平面分割零件
也可以是其他零件的面，只要是平面都可以分割零件，无论是内部还是外部的
四、工具包括：工作平面内的封闭轮廓、实体零件、曲面(需超出被分割零件边界)
首先可以按照工作平面内的封闭轮廓，将零件分割为单个或多个零件，如下图所示
也可以实体零件为工具，将相交的部分，分割出来，如下图所示
超出被分割零件边界的曲面，也可以做为工具，类似于曲面工具，如下图
以上就是<截面>命令的使用方法，如有使用问题，可回帖讨论。

倪1833 发表于 2021-4-19 11:15:57

这个命令相当有用，最近用的很多。这个命令在一些特殊情况下会出问题：
1. 切割复杂的曲面,比如切割线或者面穿过复杂倒圆处什么的
    这种情况需要造一个切割用实体，避免穿过这些曲面，然后用实体去分割
    如果切割实体边界也穿过这些曲面，也很可能切不出
2. 两个物体之间是线接触（可能也有点接触？我没有遇到过），有时也分不出
    这种情况可以多切一些，把这个接触线切到一个实体，然后通过delete face命令把多切的东西给删掉，利用insert face等修补面的工具补全实体，


以上是这个命令的两个使用小体会。关键是选好切割工具和位置，尽量不要穿过复杂面且多利用补面工具。

Superman 发表于 2021-4-19 11:36:07

倪1833 发表于 2021-4-19 11:15
这个命令相当有用，最近用的很多。这个命令在一些特殊情况下会出问题：
1. 切割复杂的曲面,比如切割线或者 ...

化整为零，化零为整，实体变曲面，曲面变实体，灵活运用

倪1833 发表于 2021-4-19 11:48:49

Superman 发表于 2021-4-19 11:36
化整为零，化零为整，实体变曲面，曲面变实体，灵活运用

是的，我最近切了一周多，基本都是这样用

Superman 发表于 2021-4-19 12:14:17

倪1833 发表于 2021-4-19 11:48
是的，我最近切了一周多，基本都是这样用

你说的复杂曲面零件，无法直接分割这种还没遇到过。比如下面的实体零件，有很多曲面构建的，但线割也是很容易。

倪1833 发表于 2021-4-19 12:51:30

Superman 发表于 2021-4-19 12:14
你说的复杂曲面零件，无法直接分割这种还没遇到过。比如下面的实体零件，有很多曲面构建的，但线割也是很 ...
可能我的原始模型是从stp转过来的，本身有一些破损我没有修复。
stp文件80M, 转成pkg后20M, 有好多错误，我没有办法处理。
只能是一点一点切割，然后逐个零件修复。
如下图中黄色的部分就无法分割。


checking part /36.142/p36.14.2 :

Warning:Body is a non-manifold part
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Inconsistent sequence of coedges at vertex
Error:Inconsistent sequence of coedges at vertex
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Inconsistent sequence of coedges at vertex
Error:Inconsistent sequence of coedges at vertex
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Error:Edge doesn't lie on face but it should
Warning:knife Edge found
Warning:knife Edge found
Warning:Advisor: Edge is short

This part is corrupt.   (Error 319)

Superman 发表于 2021-4-19 13:43:40

倪1833 发表于 2021-4-19 12:51
可能我的原始模型是从stp转过来的，本身有一些破损我没有修复。
stp文件80M, 转成pkg后20M, 有好多错误， ...

零件有问题，很多操作都可能会报错，建议先确保导入没错误，再做下一步操作。
STP导入时调整一下再导，应该就不会有破面。

倪1833 发表于 2021-4-19 14:24:08

Superman 发表于 2021-4-19 13:43
零件有问题，很多操作都可能会报错，建议先确保导入没错误，再做下一步操作。
STP导入时调整一下再导，应 ...

stp自定义精度已经试了，可能已经是最优导入。能都是实体已经不错了，可能stp本身也有点问题。

HOH 发表于 2021-4-27 20:58:49

这个命令确实非常实用，修改起来溜到飞起！

勿忘１２８√e９ 发表于 2024-10-22 08:39:02

点赞{:4_129:}

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